PT-2026-40121 · Horovod · Horovod

Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-31234

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Horovod versions prior to 0.28.2

Description The KVStore HTTP server component, used for distributed task coordination, lacks authentication and authorization controls. This allows a remote attacker to write arbitrary data using HTTP PUT requests. When a worker reads this data via HTTP GET, it uses the cloudpickle.loads() function to deserialize the data without verifying its source or integrity. An attacker can send a malicious pickle payload to the server, which, when deserialized by the victim worker, leads to remote code execution.

Recommendations Update to version 0.28.2 or later.

Fix

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2026-31234

GHSA-MF8F-X4R3-JM8C

Affected Products

Horovod

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-31234 · Security Note
• https://osv.dev/vulnerability/GHSA-mf8f-x4r3-jm8c · Vendor Advisory
• https://github.com/horovod/horovod · Note
• https://notion.so/CVE-2026-31234-35d1e139318881d585cde508b9d2453c · Note